From Where to Got Value For Quantity and alter net quantity's value

From Where to Got Value For Quantity and alter net quantity's value for my report can any one give suggestions or samples for tht.

 

you have to paste the collection first which you are repeating in the report on that we can guide you for the same

 

This is the collection
[Collection : AgentWiseSaleReportColl]

Type: Vouchers : VoucherType
Childof : $$VchTypePurchase
Fetch : Date, VoucherNumber, Partyledgername, Amount, Broker Name
Filter : SelBrokersOnly

 

Use Fetch : InventoryEntries.*

Use $$CollQtyTotal:InventoryEntries.$BilledQty

 

How can I Pick up any Amount or Quantity from any report and from voucher to any report.
Please help me